diff --git a/config/schemas/settings.json b/config/schemas/settings.json
index 34a721a61..dc52f17f4 100644
--- a/config/schemas/settings.json
+++ b/config/schemas/settings.json
@@ -53,6 +53,7 @@
 				},
 				"language" : {
 					"type":"string",
+					"enum" : [ "english", "german", "polish", "russian", "ukrainian" ],
 					"default" : "english"
 				},
 				"lastSave" : {